CKSY first broadcast on July 1, 1986, and was originally caarried 95.1 FM (which had previously been the frequency used by CBEE-FM, a rebroadcaster of CBC Radio One station CBE-AM in Windsor, now at 88.1 FM). CKSY originally aired an easy listening music format branded as "Cosy," which evolved into the current AC format by the mid-1990s.

By 2010, the station had shifted towards an hot adult contemporary format with a larger amount of current music. In 2014, sister station CKUE-FM would ultimately drop active rock for a soft AC format.[1]